Vault-13

MASIMO CORP MASI

COM · Common Stock · CUSIP 574795100 · ISIN US5747951003

358 institutional holders -59 vs Q2 2023
47,660,66847.7m shares reported held*
$4.2bnreported value*
57 new 82 added 158 reduced 118 sold out net bought ≈ $138.1m (+1.6m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($13.5m this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $87.70. Options: 23 managers hold calls ($208.1m notional), 18 hold puts ($58.0m).

Trends to Q3 2023

Institutional holders

Managers reporting a position, each quarter

0200400600Q3 22: 420Q4 22: 405Q1 23: 429Q2 23: 417Q3 23: 358358Q3 22Q4 22Q1 23Q2 23Q3 23
Numbers
QuarterHolders
Q3 2022420
Q4 2022405
Q1 2023429
Q2 2023417
Q3 2023358

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
4000400Q4 22: 154 bought or addedQ4 22: 232 cut or sold outQ4 22Q1 23: 198 bought or addedQ1 23: 180 cut or sold outQ1 23Q2 23: 159 bought or addedQ2 23: 229 cut or sold outQ2 23Q3 23: 139 bought or addedQ3 23: 276 cut or sold outQ3 23
Numbers
QuarterBought or addedCut or sold out
Q4 2022154232
Q1 2023198180
Q2 2023159229
Q3 2023139276

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$100m$200m$300mQ4 22 calls: $17.1mQ4 22 puts: $7.5mQ4 22P/C 0.44Q1 23 calls: $31.6mQ1 23 puts: $13.2mQ1 23P/C 0.42Q2 23 calls: $31.2mQ2 23 puts: $6.4mQ2 23P/C 0.21Q3 23 calls: $208.1mQ3 23 puts: $58.0mQ3 23P/C 0.28
Numbers
QuarterCallsPutsP/C
Q4 2022$17.1m$7.5m0.44
Q1 2023$31.6m$13.2m0.42
Q2 2023$31.2m$6.4m0.21
Q3 2023$208.1m$58.0m0.28

Biggest buyers

MASSACHUSETTS FINANCIAL SERVICES CO /MA/ New +1,513,449+1.5m
EMINENCE CAPITAL, LP New +1,036,253+1.0m
Jackson Square Partners, LLC Added +735,168+735.2k
Sachem Head Capital Management LP New +634,100+634.1k
Capital Research Global Investors Added +480,048+480.0k
PRICE T ROWE ASSOCIATES INC /MD/ Added +431,836+431.8k
T. Rowe Price Investment Management, Inc. Added +399,518+399.5k
HAWK RIDGE CAPITAL MANAGEMENT LP Added +314,763+314.8k
ArrowMark Colorado Holdings LLC New +302,851+302.9k
Hudson Bay Capital Management LP New +285,048+285.0k

Biggest sellers

FMR LLC Reduced -1,909,714-1.9m
Fundsmith LLP Sold out -730,377-730.4k
BlackRock Inc. Reduced -707,790-707.8k
NORGES BANK Reduced -414,060-414.1k
WESTFIELD CAPITAL MANAGEMENT CO LP Reduced -350,118-350.1k
GENEVA CAPITAL MANAGEMENT LLC Sold out -304,691-304.7k
STATE STREET CORP Reduced -261,578-261.6k
Alyeska Investment Group, L.P. Sold out -204,409-204.4k
TWO SIGMA ADVISERS, LP Reduced -163,100-163.1k
Obermeyer Wealth Partners Sold out -151,848-151.8k

Biggest calls

CITADEL ADVISORS LLC Added $49.9m569.2k shares
HBK INVESTMENTS L P Not comparable $48.2m550.0k shares
Balyasny Asset Management L.P. Added $31.9m364.0k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $12.9m147.1k shares
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC New $10.5m120.0k shares
Jefferies Financial Group Inc. New $8.7m99.5k shares
MILLENNIUM MANAGEMENT LLC Added $8.7m99.0k shares
PEAK6 Investments LLC Added $7.3m83.1k shares
Caption Management, LLC New $5.9m67.4k shares
JANE STREET GROUP, LLC Added $5.7m64.9k shares

Biggest puts

HBK INVESTMENTS L P Not comparable $15.3m175.0k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $8.9m102.0k shares
CITADEL ADVISORS LLC Added $5.6m63.3k shares
SIMPLEX TRADING, LLC Added $5.0m56.9k shares
JANE STREET GROUP, LLC Added $4.2m48.2k shares
MILLENNIUM MANAGEMENT LLC New $4.0m45.4k shares
PEAK6 Investments LLC Added $3.1m35.4k shares
CAPITAL FUND MANAGEMENT S.A. New $3.1m35.3k shares
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC New $1.8m20.0k shares
Caption Management, LLC New $1.7m19.4k shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
BlackRock, Inc. 13G · institution filed 2025-02-07 7.9% 4.2m 2025-02-07
KIANI JOE E 13G · exempt (held before listing) -3.8 pts · filed 2026-05-14 6.5% -3.8 pts 3.7m 2026-05-14
BARCLAYS PLC 13G · institution new · filed 2026-05-14 5.5% new 2.9m 2026-05-14

Fell to 5% or below in the last year: Pentwater Capital Management LP (0.0%, 2026-08-14), Politan Capital Management LP (0.0%, 2026-06-11), BlackRock Portfolio Management LLC (0.2%, 2026-04-30; now reported by BlackRock, Inc.), VANGUARD GROUP INC (0.0%, 2026-03-27), FMR LLC (4.5%, 2026-03-06)

Holders, Q3 2023

#ManagerLocationShares Value% of their portfolioChangeShares change
1 BlackRock Inc. 0.01% of their portfolio New York, NY 5,412,3335.4m $474.6m $474.6m 0.01% Reduced -707.8k -707,790
2 FMR LLC 0.04% of their portfolio BOSTON, MA 5,247,5635.2m $460.1m $460.1m 0.04% Reduced -1.9m -1,909,714
3 VANGUARD GROUP INC 0.01% of their portfolio Valley Forge, PA 4,754,8704.8m $416.9m $416.9m 0.01% Reduced -100.4k -100,399
4 Politan Capital Management LP 28.00% of their portfolio NEW YORK, NY 4,713,5184.7m $413.3m $413.3m 28.00% Unchanged
5 Capital Research Global Investors 0.05% of their portfolio Los Angeles, CA 2,132,5722.1m $187.0m $187.0m 0.05% Added +480.0k +480,048
6 MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.05% of their portfolio Boston, MA 1,513,4491.5m $132.7m $132.7m 0.05% New
7 RTW INVESTMENTS, LP 2.78% of their portfolio NEW YORK, NY 1,501,4931.5m $131.7m $131.7m 2.78% Unchanged
8 STATE STREET CORP 0.01% of their portfolio BOSTON, MA 1,403,2081.4m $123.0m $123.0m 0.01% Reduced -261.6k -261,578
9 EMINENCE CAPITAL, LP 1.80% of their portfolio NEW YORK, NY 1,036,2531.0m $90.9m $90.9m 1.80% New
10 T. Rowe Price Investment Management, Inc. 0.06% of their portfolio BALTIMORE, MD 917,526917.5k $80.4m $80.4m 0.06% Added +399.5k +399,518
11 Liontrust Investment Partners LLP 1.27% of their portfolio LONDON, X0 906,438906.4k $79.5m $79.5m 1.27% Reduced -14.0k -13,968
12 Jackson Square Partners, LLC 2.52% of their portfolio LARKSPUR, CA 861,708861.7k $75.6m $75.6m 2.52% Added +735.2k +735,168
13 GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio BOSTON, MA 699,753699.8k $61.4m $61.4m 0.01% Reduced -58.9k -58,853
14 Sachem Head Capital Management LP 2.80% of their portfolio NEW YORK, NY 634,100634.1k $55.6m $55.6m 2.80% New
15 WESTFIELD CAPITAL MANAGEMENT CO LP 0.36% of their portfolio BOSTON, MA 603,681603.7k $52.9m $52.9m 0.36% Reduced -350.1k -350,118
16 HAWK RIDGE CAPITAL MANAGEMENT LP 2.45% of their portfolio LOS ANGELES, CA 567,765567.8k $49.8m $49.8m 2.45% Added +314.8k +314,763
17 SCHRODER INVESTMENT MANAGEMENT GROUP 0.07% of their portfolio London, X0 549,676549.7k $48.2m $48.2m 0.07% Reduced -93.4k -93,379
18 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 501,904501.9k $44.0m $44.0m 0.00% Added +231.2k +231,202
19 MARTIN CURRIE LTD 1.56% of their portfolio EDINBURGH, X0 495,910495.9k $43.5m $43.5m 1.56% Reduced -6.2k -6,153
20 PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio BALTIMORE, MD 451,939451.9k $39.6m $39.6m 0.01% Added +431.8k +431,836
21 Sumitomo Mitsui Trust Group, Inc. 0.03% of their portfolio CHIYODA-KU, TOKYO, M0 405,317405.3k $35.5m $35.5m 0.03% Reduced -84.8k -84,790
22 MIG Capital, LLC 6.48% of their portfolio NEWPORT BEACH, CA 398,932398.9k $35.0m $35.0m 6.48% Added +266.7k +266,682
23 Bank of New York Mellon Corp 0.01% of their portfolio NEW YORK, NY 390,623390.6k $34.2m $34.2m 0.01% Reduced -106.5k -106,548
24 BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.10% of their portfolio Paris, I0 385,416385.4k $33.8m $33.8m 0.10% Reduced -8.5k -8,491
25 Ensemble Capital Management, LLC 3.33% of their portfolio San Francisco, CA 368,040368.0k $32.3m $32.3m 3.33% Added +76.9k +76,929
26 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio SAN FRANCISCO, CA 347,522347.5k $30.5m $30.5m 0.01% Reduced -9.6k -9,612
27 NORTHERN TRUST CORP 0.01% of their portfolio CHICAGO, IL 333,776333.8k $29.3m $29.3m 0.01% Reduced -83.8k -83,768
28 ArrowMark Colorado Holdings LLC 0.32% of their portfolio Denver, CO 302,851302.9k $26.6m $26.6m 0.32% New
29 HBK INVESTMENTS L P 0.57% of their portfolio DALLAS, TX 295,000295.0k $25.9m $25.9m 0.57% Not comparable
30 DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio AUSTIN, TX 285,446285.4k $25.0m $25.0m 0.01% Added +30.0k +29,997
31 Hudson Bay Capital Management LP 0.12% of their portfolio STAMFORD, CT 285,048285.0k $25.0m $25.0m 0.12% New
32 Clearline Capital LP 2.39% of their portfolio NEW YORK, NY 275,649275.6k $24.2m $24.2m 2.39% New
33 J.P. Morgan Private Wealth Advisors LLC 0.07% of their portfolio SAN FRANCISCO, CA 261,856261.9k $23.0m $23.0m 0.07% Reduced -713 -713
34 CITADEL ADVISORS LLC 0.02% of their portfolio MIAMI, FL 256,692256.7k $22.5m $22.5m 0.02% Added +217.2k +217,158
35 Balyasny Asset Management L.P. 0.06% of their portfolio Chicago, IL 250,428250.4k $22.0m $22.0m 0.06% Added +193.6k +193,634
36 MILLENNIUM MANAGEMENT LLC 0.02% of their portfolio NEW YORK, NY 241,201241.2k $21.1m $21.1m 0.02% Added +22.2k +22,219
37 FARALLON CAPITAL MANAGEMENT, L.L.C. 0.11% of their portfolio SAN FRANCISCO, CA 227,649227.6k $20.0m $20.0m 0.11% Reduced -140.0k -140,000
38 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.03% of their portfolio BALA CYNWYD, PA 211,632211.6k $18.6m $18.6m 0.03% Added +200.6k +200,638
39 GLENVIEW CAPITAL MANAGEMENT, LLC 0.50% of their portfolio NEW YORK, NY 208,848208.8k $18.3m $18.3m 0.50% New
40 Legal & General Group Plc 0.01% of their portfolio London, X0 201,679201.7k $17.7m $17.7m 0.01% Reduced -100.9k -100,917
41 RAYMOND JAMES & ASSOCIATES 0.01% of their portfolio ST PETERSBURG, FL 201,652201.7k $17.7m $17.7m 0.01% Reduced -63.8k -63,840
42 Wolf Hill Capital Management, LP 1.61% of their portfolio GREENWICH, CT 200,000200.0k $17.5m $17.5m 1.61% New
43 Point72 Asset Management, L.P. 0.06% of their portfolio STAMFORD, CT 186,644186.6k $16.4m $16.4m 0.06% Added +52.3k +52,321
44 SEI INVESTMENTS CO 0.03% of their portfolio OAKS, PA 183,940183.9k $16.1m $16.1m 0.03% Added +127.2k +127,249
45 JANE STREET GROUP, LLC 0.02% of their portfolio NEW YORK, NY 176,615176.6k $15.5m $15.5m 0.02% Added +175.1k +175,106
46 FEDERATED HERMES, INC. 0.04% of their portfolio PITTSBURGH, PA 169,635169.6k $14.9m $14.9m 0.04% Added +3.4k +3,400
47 PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio DES MOINES, IA 165,787165.8k $14.5m $14.5m 0.01% Reduced -18.6k -18,604
48 Retirement Systems of Alabama 0.06% of their portfolio MONTGOMERY, AL 144,598144.6k $12.7m $12.7m 0.06% Reduced -7.2k -7,179
49 RHUMBLINE ADVISERS 0.01% of their portfolio BOSTON, MA 142,529142.5k $12.5m $12.5m 0.01% Reduced -16.5k -16,455
50 Montanaro Asset Management Ltd 2.19% of their portfolio LONDON, X0 142,250142.2k $12.5m $12.5m 2.19% Unchanged
51 Rockefeller Capital Management L.P. 0.05% of their portfolio NEW YORK, NY 133,719133.7k $11.7m $11.7m 0.05% Reduced -18.3k -18,290
52 BNP PARIBAS FINANCIAL MARKETS 0.02% of their portfolio PARIS, I0 127,742127.7k $11.2m $11.2m 0.02% Added +108.3k +108,297
53 FIL Ltd 0.01% of their portfolio HAMILTON, D0 117,470117.5k $10.3m $10.3m 0.01% New
54 ExodusPoint Capital Management, LP 0.13% of their portfolio NEW YORK, NY 116,609116.6k $10.2m $10.2m 0.13% Added +109.0k +109,041
55 FIRST TRUST ADVISORS LP 0.01% of their portfolio Wheaton, IL 104,844104.8k $9.2m $9.2m 0.01% Reduced -74.4k -74,431
56 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 101,158101.2k $8.9m $8.9m 0.00% Reduced -72.8k -72,818
57 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 99,962100.0k $8.8m $8.8m 0.00% Added +6.9k +6,922
58 Swiss National Bank 0.01% of their portfolio ZURICH, V8 98,60098.6k $8.6m $8.6m 0.01% Reduced -62.2k -62,200
59 COMERICA BANK 0.04% of their portfolio DALLAS, TX 96,41496.4k $8.5m $8.5m 0.04% New
60 Nuveen Asset Management, LLC 0.00% of their portfolio CHICAGO, IL 94,21394.2k $8.3m $8.3m 0.00% Reduced -33.8k -33,803
61 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 91,87591.9k $8.1m $8.1m 0.00% Reduced -144.0k -143,975
62 BAILLIE GIFFORD & CO 0.01% of their portfolio EDINBURGH, X0 91,22991.2k $8.0m $8.0m 0.01% Reduced -3.9k -3,920
63 Cubist Systematic Strategies, LLC 0.10% of their portfolio STAMFORD, CT 89,92389.9k $7.9m $7.9m 0.10% Added +89.5k +89,523
64 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 84,93884.9k $7.4m $7.4m 0.00% Added +17.0k +16,996
65 GAMCO INVESTORS, INC. ET AL 0.09% of their portfolio GREENWICH, CT 84,50084.5k $7.4m $7.4m 0.09% Unchanged
66 California Public Employees Retirement System 0.01% of their portfolio Sacramento, CA 83,29583.3k $7.3m $7.3m 0.01% Reduced -9.6k -9,576
67 AMERIPRISE FINANCIAL INC 0.00% of their portfolio MINNEAPOLIS, MN 74,05474.1k $6.5m $6.5m 0.00% Reduced -30.9k -30,936
68 TD Asset Management Inc 0.01% of their portfolio Toronto, A6 71,43071.4k $6.3m $6.3m 0.01% Added +53.7k +53,676
69 Woodline Partners LP 0.07% of their portfolio San Francisco, CA 70,77970.8k $6.2m $6.2m 0.07% New
70 Boussard & Gavaudan Investment Management LLP 0.74% of their portfolio London, X0 70,72370.7k $6.3m $6.3m 0.74% New
71 VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.03% of their portfolio JUPITER, FL 67,79567.8k $5.9m $5.9m 0.03% New
72 Coronation Fund Managers Ltd. 0.18% of their portfolio Cape Town, T3 66,96667.0k $5.9m $5.9m 0.18% New
73 AMERICAN INTERNATIONAL GROUP, INC. 0.04% of their portfolio New York, NY 62,88562.9k $5.5m $5.5m 0.04% Reduced -10.8k -10,805
74 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 62,03262.0k $5.4m $5.4m 0.00% Reduced -7.6k -7,611
75 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 55,73755.7k $4.9m $4.9m 0.00% Added +19.4k +19,400
76 Bell Asset Management Ltd 0.79% of their portfolio Melbourne, C3 54,85354.9k $4.8m $4.8m 0.79% Added +14.3k +14,278
77 TWINBEECH CAPITAL LP 0.09% of their portfolio PURCHASE, NY 54,36154.4k $4.8m $4.8m 0.09% New
78 CITIGROUP INC 0.01% of their portfolio NEW YORK, NY 53,58353.6k $4.7m $4.7m 0.01% Reduced -11.3k -11,324
79 Bridgewater Associates, LP 0.03% of their portfolio Westport, CT 53,16853.2k $4.7m $4.7m 0.03% Reduced -2.5k -2,511
80 NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio ALBANY, NY 53,04853.0k $4.7m $4.7m 0.01% Reduced -6.4k -6,407
81 NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio ALBANY, NY 52,81852.8k $4.6m $4.6m 0.01% Reduced -11.0k -10,956
82 Wilmington Savings Fund Society, FSB 0.20% of their portfolio WILMINGTON, DE 52,30752.3k $4.6m $4.6m 0.20% Reduced -326 -326
83 LOGAN CAPITAL MANAGEMENT INC 0.23% of their portfolio Newtown Square, PA 51,28851.3k $4.5m $4.5m 0.23% Reduced -242 -242
84 SIMPLEX TRADING, LLC 0.16% of their portfolio CHICAGO, IL 50,68950.7k $4.4m $4.4m 0.16% Added +46.7k +46,724
85 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio WEST SACRAMENTO, CA 49,28149.3k $4.3m $4.3m 0.01% Reduced -23.5k -23,462
86 UBS Group AG 0.00% of their portfolio ZURICH, V8 48,06848.1k $4.2m $4.2m 0.00% Reduced -33.5k -33,518
87 Irenic Capital Management LP 1.27% of their portfolio NEW YORK, NY 47,30947.3k $4.1m $4.1m 1.27% New
88 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio TALLAHASSEE, FL 47,20647.2k $4.1m $4.1m 0.01% Reduced -6.7k -6,727
89 BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp 0.04% of their portfolio VICTORIA, A1 47,00047.0k $4.1m $4.1m 0.04% Reduced -4.0k -4,033
90 CREDIT SUISSE AG/ 0.00% of their portfolio ZURICH, V8 42,68942.7k $3.7m $3.7m 0.00% Added +3.3k +3,332
91 NS Partners Ltd 0.20% of their portfolio LONDON, X0 41,51741.5k $3.6m $3.6m 0.20% Reduced -104 -104
92 CenterBook Partners LP 0.45% of their portfolio GREENWICH, CT 41,17641.2k $3.6m $3.6m 0.45% Added +11.4k +11,421
93 Prosight Management, LP 1.11% of their portfolio DALLAS, TX 40,00040.0k $3.5m $3.5m 1.11% New
94 RK Capital Management, LLC 0.80% of their portfolio Denver, CO 38,58038.6k $3.4m $3.4m 0.80% Reduced -415 -415
95 TEXAS PERMANENT SCHOOL FUND CORP 0.03% of their portfolio AUSTIN, TX 37,62337.6k $3.3m $3.3m 0.03% Reduced -5.1k -5,131
96 State of Tennessee, Department of Treasury 0.01% of their portfolio NASHVILLE, TN 36,72336.7k $3.2m $3.2m 0.01% Added +10.6k +10,633
97 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 36,17436.2k $3.2m $3.2m 0.00% Reduced -40.3k -40,282
98 Point72 Middle East FZE 0.19% of their portfolio DUBAI, C0 35,91235.9k $3.1m $3.1m 0.19% New
99 DekaBank Deutsche Girozentrale 0.01% of their portfolio FRANKFURT, 2M 34,93034.9k $3.1m $3.1m 0.01% Added +922 +922
100 Moran Wealth Management, LLC 0.12% of their portfolio NAPLES, FL 34,75734.8k $3.0m $3.0m 0.12% Added +1.1k +1,097